Sound-reproducing device



1929- J. B. HAWLEY I SOUND REPRODUCING DEVICE Filed May 8, 1926 Patented Nov. 5, 1929 UNITED STATES" PATE NT OFFAICE JESSE B. HAWLEY, OF WILHETTE, ILLINOIS, .ASSIGNOB, BY MESNE ASSIGNMENTS, TO UNITED BEPRODUCERS CORPORATION, OF'ST. CHARLES, ILLINOIS, A CORPORATION 01 NEW JERSEY SOUND-REPRODUOING DEVICE Application filed May 8, 1928. Serial No. 107,578.

6 out the whole audible range of sound vibrations. Sound emitting or radiating members, such as dia hragms, cones and the like, usually have ndamental periods of vibrations such that when emitting vi- 39 brations of the fundamental period or frequency', will emit the sound with greatest volume, amplitude or eflioiency, while vibrations of different frequencies are rendered therefrom with less volume, amplitude and efficiency. The present invention comprehends the imposing upon such vibrating members effects that will cause them to emit sound efficiently with substantially uniform volume or amplitude throughout the whole range or audible vibrations. k

Another object of the invention is to provide for vibrating means or elements having different natural periods of vibrations or fundamental frequency points at different points than those of the sound emitting or radiating members, and so associated with the latter members to give it wide amplitude of vibration at or near the vibration frequencies of the point of the elements yet which are remote from the fundamental frequency oints of the members. In this way when virations other than those at or near the natural periods of the sound emitting members are being affected in or imposed on the members, the transmitting load will be fully effective in said members to make them vibrate with equal efiiciency and volume as if vibrating at the fundamental points thereof. Specifically, the members may be connected to the elements at loop points thereof so that when the elements are vibrating at greatest efliciency the load may be'transmitted to the members, and similarly when the members are vibrating at'frequency points of greatest efliciency', the elements are merely transmitting the vibration load without addlng thereto the amplitude of vibration of the elements when operating at greatest cificiency.

fifliainvention also includes a regenerative device of the electro-magnetic type with a permanent magnet and an electro-magnetic device for each of the members and for each of the elements, the electro-magnetic device being operative within the influence of the permanent magnet and associated with the vibratable elements and members to actuate the same in accordance with the electrical effects or changes in the electro-magnetic' devices.

Other objects, features, advantages are comprehended by the invention as will later appear and 'are inherently possessed thereby.

Referring to the drawings, 1 is a view in side elevation with parts broken away of a sound reproducing device constructed in no accordance with the invention. I

Fig. 2 is a vertical transverse sectional view of the same.

Fig. 3 is a fragmentary part elevational View of t art sectional and e power unit or capabilities and electro-magnetic regenerating parts of the devlce.

And, Fig. 4. is a fragmentary elevational view of a variation in the same. Referring now more in details to the drawlngs, the embodiment selected to illustrate the invention isshown as comprising a stand or support having a base 1 and an annular supporting member 2 having a rim portion 3 and side wall faces 4 and 5, each of the latter having circular openings 6 and 7 respectively. Extendin through these openmgs may be the outer aces of cone shaped or pyramidal sound emitting or radiating and vi brating members 8 and 9, made of any suitable material and of any suitable shape, those shown being of octagonal, but it is to be understood that they may be of any other specific form or even in the form of a cone, or even fiat or curved as in the form of ellipsoids, paraboloids and hyperboloids, if desired. The sound emittin members are referably freely suspended or supporte by flexible connecting elements 10 and 11 at a able "securing elements such as nuts and the like 16, 17, 18 and 19 threaded to the actuating members 14 and 15, the other ends of the members 14 and being secured in any suitable manner to reeds 20 and 21 as shown. It will be noted that the inner margins of the walls 4 and 5 overlap but are out of contact with the margins of the diaphragmatic members 8 and 9, yet will cover the same so as to maintain the marginal parts of the members 8 and 9 out of view.

The vibrations, are transmitted to the members 8 and 9 by way of vibrating elements, such as the reeds connected at one end thereof by suitable connecting means 22 and 23 to the legs 24 and 25 of a permanent magnet26, the latter being of any desirable shape, but for the purpose of illustration being shown upon the drawing as a U-shaped magnet. The free end of the reeds are connected through actuating elements 26 and 27 to an end of armatures 28 and 29 each disposed within a core space in electro-magnetic solenoid 30 or 31 as the case may be, crum points 32 and 33 against which the armatures 28 and 29 bear when in normal position as well .as when vibrating. The solenoids are of any desirable construction and are preferably supported by means of magnetic shoe pieces 34 and 35 secured to the poles 36 and 37, the shoe pieces being flanged so as to support between the flanges thereof ,the spools of the solenoids as shown upon the Between the solenoids may be 10- drawings. cated an intermediate shoe piece 38 having flanged portions acting as pole pieces and having a connecting part 39 to hold the flanges in proper relative position. AssumingJ one of the poles, such as the pole 36, to e of north polarity, the shoe 34 will also have the same polarity and will act with the proximate flanges of the shoe 38 so that the latter flanges will have south polarity and the opposite flanges of the same piece will have north polarity to cooperate with the shoe 31 which will be of south polarity which is also the polarity of the pole 37. If desired, resilient elements suchas springs 40 and 41 may be connected to the free ends of the armatures 28 and 29 and to any suitable fixed part of the device, such as the flanges of the shoes 34 and 35 as clearly shown in Fig. 3 of the drawings.

' Secured at any suitable point, as by the same means fgr holding the fixed ends of the 20 and 21, the latter beingthe latter being provided with' ful-" reeds, may be supported binding posts or clips 42 and 43 adapted to receive the terminals 44 and 45 of the conductors 46 and 47 of the electrical unit. The clips may also carry binding screws 48 and 49 capable ,of

securing theterminals 44 and 45 in place and {7 also serving as a connecting means for conductors50 and 51 running to the solenoids, a connecting wire 52 running between the sole.- noids as shown in Fig. 3.

The structure shown in Fig. 4 is similar to that shown in Fig. 3 with the exception that the interpolar members 53 and 54 are connected together by a non-magnetic connecting member 55, such as a brass screw or bolt 'or the like. By this structure the magnetic circuit has its flux confined to the upper and lower branches respectively of the shoe pieces thus preventing the passing of flux from a lower to an upper or from an upper to a lower shoe piece, and thus aiding in the stabilizing of the regenerating device.

The vibrating members 8 and 9 are designed, either by making them of different sizes, or of different weights, or of dilferent emitted at a fundamental point of one it will be emitted with greatest efficiency from that particular diaphragm ormember, and when the vibration imposed is that at or near the frequency point of the other, that one will be operating at greatest eiiiciency.v If, however, the vibrations be remote from any of the frequency points of'the diaphra s 8 or 9 or both, the reeds 20 and 21 are so esigned that they will also have frequency natural periods at a'diiferent part 0 the range of audible vibrations so that should the vibrations imposed by the electrical device he at 0111188.! the frequency points of thejreeds, and at which frequency points the diaphragms 8 and 9 wouldnot vibrate with greatest efficiency or amplitude, the reeds 20 and 21 will vibrate with greatest efficiency and amplitude and by reason of connecting the actuating elements 14' and 15 at loop points of the reed, the vibrations will be transmitted to the diaphragms 8 and 9 as a load imposed thereon to give the diaphragms oints' or remote from their fundamentals but at or near the fundamentals of the diaphragms 8 or 9 or both, the vibrationload be transmitted through the reed as a rigid member and through the elements 14 and 15 to the diaphragms, the latter acting at their greatest efliclency because of the fact of the vibrations being imposed are at or near the fundamentals of the diaphragms.

It is to be understood that the invention is not limited to two diaphragms and two sole noids, as shown, but the specific embodiment shown is merely illustrative and that any number of diaphragms may be used, and it is preferable that each diaphragm and reed may be operated by a solenoid which may be ina single permanent magnet and the interpolar shoes thereof.

While I have herein described and upon the drawings shown illustrative embodiments of the invention, it is to be understood that the invention is not limited thereto but may comprehend other constructions, parts, arrangements of parts, details, features and the like without departing from the spirit thereof.

Having thus disclosed the inventfion, I claim 1. A sound reproducing device comprising freely suspended vibratable members having different natural periods of vibration, a support therefor, an electro-magnetic device for effecting vibrations in said members in accordance with the electrical effects in said electro-magnetic device, and means connecting said members and said electro-magnetic device forimparting vibrations to said members. n

2. A sound reproducing device comprising vibratable members having different natural periods of vibration, a support therevibrations in said members in accordance with the electrical efiects insaid electro-magnetic device, vibratable elements adapted to be actuated by said electro-magnetic device periods, means connecting said memberszto said elements at loop points thereof whereby said members may have imposed thereon vibrations of the periods peculiar to said elements. 3. A sound reproducing device comprising vibratable members having different natural periods of vibration, a support therefor, an electro-magnetic device for effecting vibrations in said members in accordance with the electrical effects in said electro-magnetic device, vibratable elements having different natural periods of vibration at points in the range of audible vibrations remote from the points of the natural periods of said members, means connected to said elements and actuated by said electro-magnetic device to vibrate said elements, and means connecting said elements and said memberswhereby vibrations at and in the vicinity of the natural period of the elements will be imposed with greater amplitude upon said members'whereby the sound Waves emitted from said members will be of substanfiuenced by a single magnetic system, such as for, an electro-magnetic device for effectingand having nodal and loop points of given tially uniform amplitude over the audible range of vibrations. I

4;. A sound reproducingdevice, comprising a sound emitting vibratable member having a natural, period of vibration within the audible range of vibrations, a vibratable element having a natural period of vibration at a .point remote from the natural period of said member and having a loop of vibration of greatest amplitude at the natural period thereof, means for connecting said element and said member whereby vibrations maybe imparted from said element to said member, and an electromagnetic device for effecting vibrations in said element in accordance with the electrical effects in said electro-magnetic' device, said electro-magnetic device having a vibratory armature connected to saidevibratable element. 1

v5. A sound reproducing device, comprisg5 ing assoun d emitting'vibratable member capable of efficiently reproducing effects at one part of an audible range of vibrations, a load transmitting and vibratable element capable of efficient action at another part of an audi- 9o ble range of vibrations and being associated with said member to effect efficient vibr'ations thereof at the latter part of the audible range of vibrations and to transmit the load to the member for the efficient vibration thereofalso at the former part of the audible range of vibrations, and electro-magnetic means for imposing vibrations in said element for transmission to said member and having a vibratory armature connected to said vibratable element. r p

6. A sound reproducing device, comprise y ing a plurality of sound emitting members having different fundamental periods of, vibrations located at a part of an audible range of vibrations, load transmitting vibratable elements-having different fundamental periods of vibrations located at another part of an audible range of vibrations and connectedto said members to effect substantially 11 uniform efficiency of sound emission there-. from, and electro-magnetic means for effecting vibrations in said elements and said members in accordance with the electrical effects in said electro-magnetic device.

7. A telephone instrument having independently mounted diaphragms of unequal size, an electromagnetic mechanism having vibratory means supported independently of said diaphragms, vibratable elements having different natural periods of vibration, and operative connections between said elements and said diap'hragms and means. i

In witness whereof, I hereunto subscribe my name to this specification.

JESSE B. HAWLEY- 

